Accepted Answer

Engine Control Module Connector End Views

Connector 1:	Engine Control Module (ECM) C1
Connector 2:	Engine Control Module (ECM) C2

Engine Control Module (ECM) C1

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Connector Part Information OEM: 15499466 Service: 88988931 Description: 73-Way F Receptacle 0.64 Sealed (BK)

Terminal Part Information Pins: 73 Terminal/Tray: 7116-4152-02/9 Core/Insulation Crimp: A/5 Release Tool/Test Probe: 12094430/J-35616-4A (PU) Pins: 1, 12-13, 16-17, 23-24, 29-36, 50-52, 56-59, 63, 68, 70-71 Terminal/Tray: XXXXX-XXXX/23 Core/Insulation Crimp: H/H Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU) Pins: 2, 9-11, 18-20, 27-28, 37-38, 41, 47, 49, 61, 64-65, 69 Terminal/Tray: XXXXX-XXXX/23 Core/Insulation Crimp: J/J Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C1

Pin	Wire Color	Circuit No.	Function
1	OG/BK	1786	Park/Neutral Signal
2	GY/BK	1694	4WD Low Signal (NP8)
3-8	--	--	Not Used
9	L-BU/WH	6311	Brake Switch Signal
10	PU/WH	1668	HO2S High Signal - Bank 1 Sensor 2
11	TN/WH	1669	HO2S Low Signal - Bank 1 Sensor 2
12	OG/BK	380	A/C Refrigerant Pressure Sensor Signal
13	TN	5514	Low Reference
14-15	--	--	Not Used
16	PU	1589	Fuel Level Sensor Signal - Primary
17	D-BU/WH	473	High Speed Cooling Fan Relay Control
18	D-BU	5985	Accessory Wakeup Serial Data
19	PK	439	Ignition 1 Voltage
20	RD/WH	440	Battery Positive Voltage
21-22	--	--	Not Used
23	PU	1272	Low Reference
24	D-GN	890	Fuel Tank Pressure Sensor Signal
25-26	--	--	Not Used
27	TN	2501	High Speed GMLAN Serial Data Bus -
28	TN/BK	2500	High Speed GMLAN Serial Data Bus +
29	D-BU	1161	APP Sensor 1 Signal
30	BN	1271	Low Reference
31	TN/BK	6049	Low Reference
32	L-BU	1162	APP Sensor 2 Signal
33	GY	2709	5-Volt Reference
34	GY/WH	2700	5-Volt Reference
35	--	--	Not Used
36	TN	1274	5-Volt Reference
37	TN/BK	472	IAT Sensor Signal
38	TN	2760	Low Reference
39-40	--	--	Not Used
41	YE	492	MAF Sensor Signal
42-46	--	--	Not Used
47	PK/BK	1339	Ignition 1 Voltage
48	--	--	Not Used
49	TN	1671	HO2S Low Signal - Bank 2 Sensor 2
50	D-GN/WH	465	Fuel Pump Relay Control - Primary
51	TN	1465	Fuel Pump Relay Control - Secondary (Except NQZ)
52	YE/BK	625	Starter Enable Relay Control
53-55	--	--	Not Used
56	WH/BK	1164	5-Volt Reference
57	YE/BK	1827	Vehicle Speed Signal (JH6/JH7)
58	D-GN	335	Low Speed Cooling Fan Relay Control
59	YE	5991	Powertrain Relay Coil Control
60	--	--	Not Used
61	WH	1310	EVAP Canister Vent Solenoid Control
62	--	--	Not Used
63	D-GN/WH	459	A/C Compressor Clutch Relay Control
64	OG/WH	3223	HO2S Heater Low Control - Bank 2 Sensor 2
65	GY/WH	3122	HO2S Heater Low Control - Bank 1 Sensor 2
66-67	--	--	Not Used
68	BN/WH	419	MIL Control
69	PU	1670	HO2S High Signal - Bank 2 Sensor 2
70	--	--	Not Used
71	OG/BK	6399	Replicated TOS Signal
72	--	--	Not Used
73	BK/WH	451	Ground

Engine Control Module (ECM) C2

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Connector Part Information OEM: 13511426 Service: 19115670 Description: 80-Way F Receptacle 0.64 2.8 Sealed (GY)

Terminal Part Information Pins: 2-3, 16, 34-35, 41-53, 58, 63-69 Terminal/Tray: XXXXX-XXXX/23 Core/Insulation Crimp: H/H Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU) Pins: 5-14, 17-33, 37-40, 56-57, 59-61, 70-79 Terminal/Tray: XXXXX-XXXX/23 Core/Insulation Crimp: Pins 5-14, 17-22, 29-33, 37-40, 56-57, 59-61, 70-79: J/J Core/Insulation Crimp: Pins 26-27: K/K Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)

Engine Control Module (ECM) C2

Pin	Wire Color	Circuit No.	Function
1	--	--	Not Used
2	PU/WH	6270	5-Volt Reference
3	GY	2701	5-Volt Reference
4	--	--	Not Used
5	BN	582	TAC Motor Control - 2
6	YE	581	TAC Motor Control - 1
7	--	--	Not Used
8	D-GN/WH	428	EVAP Canister Purge Solenoid Control
9	GY	5493	Cylinder 6 Shutoff Solenoid Control 3 (LY5/LMG/L76/LC9)
10	D-BU	5491	Cylinder 1 Shutoff Solenoid Control 1 (LY5/LMG/L76/LC9)
11	OG	5494	Cylinder 4 Shutoff Solenoid Control 2 (LY5/LMG/L76/LC9)
12	GY/WH	3113	HO2S Heater Low Control - Bank 1 Sensor 1
13	L-GN	3212	HO2S Heater Low Control - Bank 2 Sensor 1
14	L-GN/BK	5492	Cylinder 7 Shutoff Solenoid Control 4 (LY5/LMG/L76/LC9)
15	--	--	Not Used
16	PU	5284	Camshaft Actuator Solenoid Control (L76,L92,LY6)
17	D-BU/WH	878	Fuel Injector 8 Control
18	TN/WH	845	Fuel Injector 5 Control
19	YE/BK	846	Fuel Injector 6 Control
20	TN	1744	Fuel Injector 1 Control
21	YE	410	ECT Sensor Signal
22	TN	2761	Low Reference
23-25	--	--	Not Used
26	D-BU	496	Knock Sensor 1 Signal
27	GY	1716	Low Reference
28	--	--	Not Used
29	L-BU	1876	Knock Sensor 2 Signal
30	GY	2303	Low Reference
31	--	--	Not Used
32	GY	23	Generator Field Duty Cycle Signal
33	BN	1174	Oil Level Switch Signal
34	BK	2755	Low Reference
35	TN	2752	Low Reference
36	--	--	Not Used
37	L-GN/BK	1745	Fuel Injector 2 Control
38	PK/BK	1746	Fuel Injector 3 Control
39	L-BU/BK	844	Fuel Injector 4 Control
40	OG/BK	877	Fuel Injector 7 Control
41	GY	2705	5-Volt Reference
42	--	--	Not Used
43	GY	2704	5-Volt Reference
44	D-BU	6259	5-Volt Reference
45-49	--	--	Not Used
50	TN/WH	331	Oil Pressure Sensor Signal
51	--	--	Not Used
52	TN	2199	Low Reference (L76, L92, LY6)
53	OG/BK	469	Low Reference
54-55	--	--	Not Used
56	TN	1664	HO2S Low Signal - Bank 1 Sensor 1
57	PU/WH	1665	HO2S High Signal - Bank 1 Sensor 1
58	L-GN	432	MAP Sensor Signal
59	PU	1666	HO2S High Signal - Bank 2 Sensor 1
60	TN	1667	HO2S Low Signal - Bank 2 Sensor 1
61	BN	25	Charge Indicator Control/Charge Indicator Signal
62	--	--	Not Used
63	PU	486	TP Sensor 2 Signal
64	D-BU/WH	6265	CMP Sensor Signal
65	D-GN	485	TP Sensor 1 Signal
66	BN	6266	Low Reference
67	--	--	Not Used
68	WH/BK	6271	CKP Sensor Signal
69	GY/BK	6272	Low Reference
70	PU	2121	IC 1 Control
71	PU/WH	2128	IC 8 Control
72	OG	2127	IC 7 Control
73	OG/WH	2122	IC 2 Control
74	L-BU/WH	2126	IC 6 Control
75	D-GN	2125	IC 5 Control
76	D-GN/WH	2124	IC 4 Control
77	L-BU	2123	IC 3 Control
78	BN	2129	Low Reference
79	BN/WH	2130	Low Reference
80	--	--	Not Used

Expert:	Dan
Pos. Feedback:	99.0 %
Accepts:	2012
Answered:	8/2/2008

Auto Technician

GM Mark of Excellence/ Service Guild Participant with 13 years experience, ASE Master Certified